Busbar Sizing Calculator
Size busbars for continuous current and short circuit withstand.
Standard Busbar Sizes
| Size (in) | Area (in²) | Cu Amps | Al Amps |
|---|
Busbar Design Guidelines
Current Density Limits
- Copper: 1000-1500 A/in² (enclosed)
- Copper: 1200-1800 A/in² (open air)
- Aluminum: 600-1000 A/in² (enclosed)
- Aluminum: 800-1200 A/in² (open air)
Installation Factors
- Vertical mounting: 15-20% higher ampacity
- Spacing: 1x bar thickness minimum
- Multiple bars: Derate 80% per added bar
- Enclosed: Derate 20-30% from open air